So the question is; why doesn’t it work on your multisite. The weird thing is that on the 2nd site (wollongbar) there’s no indication what-so-ever that AO is active. Some questions that will hopefully help us identify the problem:
* are you using the exact same theme & plugins on both sides?
* are there other sites on the multisite (and if not, can you test with one)? do they get optimized?
* is there any information in your phperror-logfile that could be helpful?

thanks for your reply. I forgot to tick the ‘follow-up’ box, so I didn’t get your message… silly me 😉

Okay, back to the problem.
– Yes, I’m using the same theme and plugins on all sides
– and yes, there are other sides as well (8 altogether), but all of them using the same theme and plugins.
– Re. phperror-logfile. is this the file in the root directory called ‘error_log’? If yes, there is nothing helpful in there either.

Actually I had one plugin deactivated on all sub pages, the slider, but now it’s activated on all of them but AO still works only on the main page. From the top navigation ‘Campus’ you can visit all the sub pages. AO is activated now on all of them. It would be such a shame if I can’t use your plugin. It would be nice if you could have another look.

re: error-log; depends on your hoster’s configuration, really, but if the file you looked into has PHP-errors, -warnings and -notices, then yeah, that one.

the cache info makes sense; your main site has cached styles & scripts because AO works, the other ones don’t because somehow AO does not get triggered. I can create a autoptimize.php with some debug code in it, if you’re interested? That way we would at least have the start of an idea of why AO isn’t autoptimizing your subsites?

well, that “content encoding error” is interesting in its own right … if the content is gzipped/ deflated, ao won’t see a thing and won’t be able to optimize. the debug-output would then be inserted in the gzipped/ deflated content, leading to the “content encoding error”.

could you retry and
* disable/ reenable your other plugins (esp. other performance-related plugins)?
* toggle some settings on/off to see if you still have the content encoding error when HTML, CSS or JS optimalisation are off?

Hi Frank,
sorry it took me so long, but I had to create another sub page.

I’ve tried all combinations, disabled and re-enabled different plugins – nothing. Unfortunately I can’t deactivate all the plugins. The site wouldn’t function anymore and I never know when and whether students are using the site or not. I might give it another go on the weekend.
If you have any particular plugin in mind that could cause the problem, please let me know.
Your plugin is activated on the main site and here at the moment.

By the way, I tried once Better WP Minify. Works on the main page only and breaks all sub pages – so, even worse…
Cheers